Shell Shield (Card)
Shell Shield
In 2670 decks
0% of 1898348 decks
Top Commanders (7)
Verazol, the Split Current
35.71% of 952 decks
340 decks
Charix, the Raging Isle
28.08% of 2144 decks
602 decks
Geralf, Visionary Stitcher
10.33% of 891 decks
92 decks
Archelos, Lagoon Mystic
8.96% of 3348 decks
300 decks
Orvar, the All-Form
2.37% of 7462 decks
177 decks
Talrand, Sky Summoner
2.18% of 5043 decks
110 decks
Arcades, the Strategist
0.49% of 14849 decks
73 decks
New Cards (5)
Canyon Crab
48% of 21 decks
+47% synergy
Hedge Maze
45% of 49 decks
+40% synergy
The Pride of Hull Clade
45% of 103 decks
+44% synergy
Mirelurk Queen
44% of 55 decks
+40% synergy
Underground Mortuary
32% of 19 decks
+26% synergy
High Synergy Cards (10)
Bedrock Tortoise
63% of 189 decks
+63% synergy
Gorex, the Tombshell
51% of 495 decks
+51% synergy
Wandering Tombshell
42% of 514 decks
+42% synergy
Growth Spiral
45% of 1029 decks
+40% synergy
Ancient Lumberknot
40% of 333 decks
+40% synergy
High Alert
39% of 333 decks
+39% synergy
Blossoming Tortoise
38% of 260 decks
+38% synergy
Huatli, the Sun's Heart
35% of 158 decks
+35% synergy
Shore Up
36% of 1811 decks
+35% synergy
Stoneskin
35% of 265 decks
+35% synergy
Top Cards (10)
Cultivate
57% of 1029 decks
+35% synergy
Rampant Growth
47% of 1029 decks
+30% synergy
Counterspell
46% of 2668 decks
+25% synergy
Negate
45% of 2668 decks
+34% synergy
Kodama's Reach
36% of 1029 decks
+21% synergy
Deathsprout
34% of 345 decks
+33% synergy
Assault Formation
34% of 1029 decks
+33% synergy
Vastwood Surge
34% of 1026 decks
+33% synergy
Joint Exploration
33% of 731 decks
+32% synergy
Colossal Skyturtle
33% of 921 decks
+32% synergy
Creatures (50)
Murasa Sproutling
33% of 1026 decks
+33% synergy
Quandrix Cultivator
31% of 1000 decks
+31% synergy
Kappa Tech-Wrecker
31% of 932 decks
+31% synergy
Vine Gecko
31% of 1026 decks
+31% synergy
Lullmage's Familiar
30% of 1026 decks
+30% synergy
Hexbane Tortoise
29% of 731 decks
+29% synergy
Gnarlid Colony
29% of 1029 decks
+29% synergy
Elfhame Druid
29% of 1029 decks
+28% synergy
Mold Shambler
28% of 1029 decks
+28% synergy
Cragplate Baloth
28% of 1026 decks
+28% synergy
Wolfbriar Elemental
28% of 1029 decks
+28% synergy
Meandering Towershell
27% of 1029 decks
+27% synergy
Sanctuary Wall
27% of 11 decks
+27% synergy
Thunderous Snapper
27% of 1029 decks
+27% synergy
Wall of Denial
27% of 333 decks
+26% synergy
Scuttlegator
27% of 1029 decks
+27% synergy
Steelbane Hydra
27% of 1029 decks
+26% synergy
Vineshaper Prodigy
25% of 763 decks
+25% synergy
Elvish Hydromancer
23% of 751 decks
+23% synergy
Citanul Woodreaders
23% of 1029 decks
+23% synergy
Territorial Allosaurus
23% of 1029 decks
+23% synergy
Goblin Electromancer
23% of 352 decks
+21% synergy
Ruin Crab
23% of 2668 decks
+21% synergy
Mirrorshell Crab
22% of 2391 decks
+22% synergy
Forgotten Ancient
22% of 1029 decks
+19% synergy
The Council of Four
22% of 267 decks
+21% synergy
Storm-Kiln Artist
22% of 348 decks
+17% synergy
Wall of Omens
21% of 333 decks
+20% synergy
Feather, the Redeemed
21% of 63 decks
+20% synergy
Thassa's Emissary
21% of 2668 decks
+21% synergy
Goliath Paladin
20% of 255 decks
+20% synergy
Untamed Kavu
20% of 1029 decks
+20% synergy
Purple-Crystal Crab
19% of 2668 decks
+19% synergy
Crystacean
19% of 2668 decks
+19% synergy
Chromeshell Crab
18% of 2668 decks
+18% synergy
Balmor, Battlemage Captain
18% of 246 decks
+17% synergy
Ancient Crab
18% of 2668 decks
+18% synergy
White Plume Adventurer
18% of 277 decks
+17% synergy
Third Path Iconoclast
18% of 187 decks
+16% synergy
Guttersnipe
18% of 352 decks
+15% synergy
Evolution Sage
17% of 1029 decks
+14% synergy
Dreadlight Monstrosity
17% of 2471 decks
+17% synergy
Skittering Crustacean
17% of 2668 decks
+17% synergy
Mentor of the Meek
17% of 333 decks
+14% synergy
Flumph
17% of 323 decks
+16% synergy
Kami of Whispered Hopes
17% of 350 decks
+13% synergy
Fortress Crab
17% of 2668 decks
+17% synergy
Horseshoe Crab
16% of 2668 decks
+16% synergy
Vintara Snapper
16% of 1029 decks
+16% synergy
Vorel of the Hull Clade
16% of 1029 decks
+15% synergy
Instants (50)
Inscription of Abundance
33% of 1026 decks
+32% synergy
Beast Within
31% of 1029 decks
+12% synergy
Swords to Plowshares
31% of 333 decks
+3% synergy
Grim Contest
31% of 345 decks
+31% synergy
Sultai Charm
30% of 345 decks
+29% synergy
Dive Down
27% of 2668 decks
+27% synergy
Flow of Knowledge
27% of 1430 decks
+26% synergy
Strength of the Tajuru
26% of 1029 decks
+26% synergy
Opt
25% of 2668 decks
+20% synergy
High Tide
24% of 2668 decks
+23% synergy
Vines of Vastwood
24% of 1029 decks
+24% synergy
Return to Nature
23% of 1029 decks
+20% synergy
Twisted Image
23% of 2668 decks
+23% synergy
Putrefy
23% of 345 decks
+19% synergy
Bar the Door
21% of 333 decks
+21% synergy
Engulf the Shore
21% of 2668 decks
+20% synergy
Into the Roil
21% of 2668 decks
+20% synergy
Brainstorm
20% of 2668 decks
+8% synergy
Wild Onslaught
19% of 1029 decks
+19% synergy
Bant Charm
19% of 158 decks
+18% synergy
Refuse to Yield
18% of 292 decks
+18% synergy
Filter Out
18% of 824 decks
+17% synergy
Tower Defense
18% of 1029 decks
+18% synergy
Slip Out the Back
18% of 2219 decks
+17% synergy
Murder
18% of 514 decks
+16% synergy
Felonious Rage
17% of 23 decks
+17% synergy
Demand Answers
17% of 23 decks
+11% synergy
Aegis of the Heavens
17% of 333 decks
+16% synergy
Thrill of Possibility
16% of 352 decks
+11% synergy
Abrade
16% of 352 decks
+11% synergy
Invigorating Surge
16% of 1029 decks
+15% synergy
Path to Exile
16% of 333 decks
-3% synergy
Pongify
15% of 2668 decks
+10% synergy
Aetherize
15% of 2668 decks
+13% synergy
Generous Gift
15% of 333 decks
+3% synergy
Obscura Charm
15% of 40 decks
+15% synergy
Repulsive Mutation
15% of 68 decks
+13% synergy
Big Score
15% of 307 decks
+10% synergy
Heroic Intervention
14% of 1029 decks
+0% synergy
Blink of an Eye
14% of 2668 decks
+13% synergy
Gaea's Gift
13% of 486 decks
+12% synergy
Despark
13% of 45 decks
+9% synergy
Solidarity
13% of 333 decks
+13% synergy
Lightning Bolt
13% of 352 decks
+8% synergy
Disenchant
12% of 333 decks
+10% synergy
Chaos Warp
12% of 352 decks
-4% synergy
Your Temple Is Under Attack
12% of 265 decks
+11% synergy
Izzet Charm
12% of 352 decks
+11% synergy
Seething Song
12% of 352 decks
+9% synergy
Family Reunion
11% of 35 decks
+11% synergy
Sorceries (50)
Grow from the Ashes
31% of 1029 decks
+31% synergy
Slaughter the Strong
29% of 333 decks
+28% synergy
Dusk // Dawn
29% of 333 decks
+28% synergy
Crippling Fear
27% of 503 decks
+26% synergy
Farseek
26% of 1029 decks
+10% synergy
Reclaim the Wastes
24% of 1026 decks
+24% synergy
Fell the Mighty
23% of 333 decks
+22% synergy
Primal Growth
23% of 1029 decks
+23% synergy
Villainous Wealth
22% of 345 decks
+21% synergy
Expel the Interlopers
20% of 64 decks
+20% synergy
Kindred Dominance
20% of 514 decks
+18% synergy
Hard Evidence
19% of 2589 decks
+19% synergy
Slip Through Space
17% of 2668 decks
+17% synergy
Whelming Wave
16% of 2668 decks
+15% synergy
Flow of Ideas
16% of 2668 decks
+15% synergy
Ponder
15% of 2668 decks
+8% synergy
Preordain
15% of 2668 decks
+9% synergy
Field Research
15% of 2658 decks
+15% synergy
Faithless Looting
15% of 352 decks
+6% synergy
Distant Melody
15% of 2668 decks
+12% synergy
Unnatural Restoration
14% of 422 decks
+12% synergy
Rite of Replication
14% of 2668 decks
+12% synergy
Spectral Deluge
14% of 2626 decks
+13% synergy
Nature's Lore
14% of 1029 decks
-1% synergy
Inscription of Insight
14% of 2658 decks
+13% synergy
Blasphemous Act
13% of 352 decks
-3% synergy
Hunting Wilds
13% of 1029 decks
+13% synergy
Explore
13% of 1029 decks
+9% synergy
Ravenform
13% of 2626 decks
+11% synergy
Three Visits
12% of 1029 decks
+0% synergy
The Battle of Bywater
11% of 90 decks
+10% synergy
Harmonize
11% of 1029 decks
+6% synergy
Saproling Migration
10% of 1029 decks
+10% synergy
Urban Evolution
10% of 1029 decks
+9% synergy
Cruel Ultimatum
9% of 53 decks
+9% synergy
Grapeshot
9% of 352 decks
+7% synergy
Migration Path
9% of 1029 decks
+7% synergy
Birthday Escape
9% of 739 decks
+8% synergy
Bala Ged Recovery
9% of 1026 decks
+4% synergy
Damn
9% of 44 decks
+5% synergy
Ringsight
9% of 178 decks
+7% synergy
Last March of the Ents
9% of 279 decks
+6% synergy
Past in Flames
9% of 352 decks
+7% synergy
Mana Geyser
9% of 352 decks
+5% synergy
Maddening Cacophony
9% of 2658 decks
+8% synergy
Thirsting Roots
8% of 394 decks
+7% synergy
Tormenting Voice
8% of 352 decks
+7% synergy
In Garruk's Wake
8% of 514 decks
+6% synergy
Seize the Spoils
8% of 349 decks
+6% synergy
Crash Through
8% of 352 decks
+7% synergy
Utility Artifacts (35)
Swiftfoot Boots
31% of 2668 decks
+3% synergy
Blackblade Reforged
19% of 2668 decks
+15% synergy
Rammas Echor, Ancient Shield
19% of 37 decks
+18% synergy
Winged Boots
15% of 2565 decks
+14% synergy
Kefnet's Monument
15% of 2668 decks
+14% synergy
Instruments of War
14% of 1235 decks
+14% synergy
Wayfarer's Bauble
14% of 2668 decks
+2% synergy
Fireshrieker
13% of 2668 decks
+11% synergy
Slagwurm Armor
12% of 2668 decks
+11% synergy
Mithril Coat
12% of 739 decks
+5% synergy
Ozolith, the Shattered Spire
11% of 350 decks
+8% synergy
Strata Scythe
11% of 2668 decks
+11% synergy
Lightning Greaves
11% of 2668 decks
-15% synergy
Sword of the Animist
10% of 2668 decks
+5% synergy
Vanquisher's Banner
9% of 2668 decks
+5% synergy
Bident of Thassa
9% of 2668 decks
+6% synergy
Twinning Staff
9% of 2668 decks
+7% synergy
Delver's Torch
8% of 320 decks
+8% synergy
Obelisk of Urd
8% of 2668 decks
+7% synergy
Icon of Ancestry
8% of 2668 decks
+7% synergy
Sapphire Medallion
8% of 2668 decks
+6% synergy
The Millennium Calendar
7% of 320 decks
+5% synergy
Shell of the Last Kappa
7% of 2668 decks
+7% synergy
Explorer's Scope
7% of 2668 decks
+6% synergy
Herald's Horn
7% of 2668 decks
+1% synergy
Bitterthorn, Nissa's Animus
7% of 949 decks
+5% synergy
Robe of Stars
7% of 320 decks
+6% synergy
Haunted Cloak
6% of 2668 decks
+6% synergy
Thran Power Suit
6% of 1430 decks
+5% synergy
Ring of Evos Isle
6% of 2668 decks
+6% synergy
Loxodon Warhammer
6% of 2668 decks
+3% synergy
Hero's Heirloom
6% of 1867 decks
+5% synergy
Door of Destinies
5% of 2668 decks
+4% synergy
Sword of Forge and Frontier
5% of 1125 decks
+4% synergy
Mirror Shield
5% of 2668 decks
+5% synergy
Enchantments (50)
Eaten by Piranhas
24% of 320 decks
+23% synergy
Aqueous Form
23% of 2668 decks
+20% synergy
Brave the Sands
22% of 333 decks
+21% synergy
Scuttletide
19% of 2592 decks
+19% synergy
Treefolk Umbra
19% of 1029 decks
+19% synergy
Reflections of Littjara
19% of 2626 decks
+16% synergy
Whirlwind of Thought
17% of 63 decks
+16% synergy
Crab Umbra
17% of 2668 decks
+17% synergy
Hydra's Growth
16% of 1029 decks
+15% synergy
Simic Ascendancy
16% of 1029 decks
+15% synergy
Sight of the Scalelords
15% of 1029 decks
+15% synergy
Retreat to Coralhelm
14% of 2668 decks
+13% synergy
Eland Umbra
14% of 333 decks
+14% synergy
Roost of Drakes
13% of 2658 decks
+13% synergy
Security Bypass
13% of 2251 decks
+13% synergy
Case of the Locked Hothouse
13% of 55 decks
+10% synergy
Jeskai Ascendancy
13% of 63 decks
+12% synergy
Undercellar Sweep
12% of 266 decks
+12% synergy
Sword Coast Sailor
11% of 2080 decks
+11% synergy
Saproling Infestation
11% of 1029 decks
+11% synergy
Primal Empathy
11% of 1029 decks
+10% synergy
Propaganda
11% of 2668 decks
+5% synergy
Rhystic Study
11% of 2668 decks
-3% synergy
Kindred Discovery
11% of 2668 decks
+7% synergy
Bubble Snare
10% of 2658 decks
+10% synergy
Ichthyomorphosis
10% of 2668 decks
+10% synergy
Tribute to the World Tree
10% of 364 decks
+5% synergy
Hardened Scales
9% of 1029 decks
+6% synergy
Hadana's Climb
9% of 1029 decks
+9% synergy
The Birth of Meletis
9% of 333 decks
+9% synergy
Retreat to Hagra
9% of 514 decks
+8% synergy
Fae Flight
9% of 123 decks
+9% synergy
Imprisoned in the Moon
9% of 2668 decks
+7% synergy
Proft's Eidetic Memory
8% of 146 decks
+7% synergy
Case of the Ransacked Lab
8% of 112 decks
+6% synergy
Wizard Class
8% of 2571 decks
+6% synergy
Petrify
8% of 40 decks
+7% synergy
Double Vision
7% of 352 decks
+6% synergy
Ghostly Prison
7% of 333 decks
+1% synergy
Sorcerer Class
7% of 342 decks
+6% synergy
Branching Evolution
7% of 1029 decks
+5% synergy
Aether Tunnel
7% of 2668 decks
+6% synergy
Frogify
7% of 2668 decks
+6% synergy
Temur Ascendancy
7% of 92 decks
+5% synergy
Rhythm of the Wild
7% of 92 decks
+1% synergy
Reconnaissance Mission
6% of 2668 decks
+4% synergy
Combat Research
6% of 1811 decks
+5% synergy
Tavern Brawler
6% of 280 decks
+6% synergy
Witness Protection
6% of 2259 decks
+5% synergy
Angelic Shield
6% of 333 decks
+6% synergy
Planeswalkers (5)
Teyo, the Shieldmage
10% of 333 decks
+10% synergy
Jace, Mirror Mage
10% of 2655 decks
+9% synergy
Teyo, Geometric Tactician
7% of 67 decks
+7% synergy
Ral, Storm Conduit
7% of 352 decks
+6% synergy
Dakkon, Shadow Slayer
7% of 44 decks
+7% synergy
Utility Lands (34)
Restless Reef
32% of 81 decks
+31% synergy
Reliquary Tower
29% of 2668 decks
+1% synergy
Rogue's Passage
27% of 2668 decks
+8% synergy
Mystic Sanctuary
26% of 2668 decks
+20% synergy
Restless Vinestalk
25% of 218 decks
+24% synergy
Bojuka Bog
22% of 514 decks
+6% synergy
Oran-Rief, the Vastwood
13% of 1029 decks
+11% synergy
Rivendell
13% of 710 decks
+10% synergy
Restless Cottage
12% of 121 decks
+11% synergy
Temple of the False God
11% of 2668 decks
+1% synergy
Throne of Makindi
10% of 2655 decks
+10% synergy
Castle Vantress
10% of 2668 decks
+8% synergy
Lonely Sandbar
10% of 2668 decks
+8% synergy
Lumbering Falls
10% of 1029 decks
+9% synergy
Witch's Cottage
10% of 514 decks
+7% synergy
Halimar Depths
9% of 2668 decks
+8% synergy
Restless Spire
8% of 84 decks
+7% synergy
Hidden Cataract
8% of 409 decks
+7% synergy
Access Tunnel
8% of 2610 decks
+6% synergy
Hidden Nursery
8% of 192 decks
+7% synergy
The Hunter Maze
8% of 405 decks
+7% synergy
Coral Atoll
7% of 2668 decks
+7% synergy
The Black Gate
7% of 173 decks
+5% synergy
Boseiju, Who Endures
7% of 936 decks
-3% synergy
Alchemist's Refuge
7% of 1029 decks
+5% synergy
Wandering Fumarole
6% of 352 decks
+6% synergy
The Surgical Bay
6% of 1085 decks
+6% synergy
Forgotten Cave
6% of 352 decks
+3% synergy
Llanowar Reborn
6% of 1029 decks
+5% synergy
Otawara, Soaring City
6% of 2425 decks
-3% synergy
Mosswort Bridge
6% of 1029 decks
+1% synergy
Karn's Bastion
5% of 2668 decks
+0% synergy
Desolate Lighthouse
5% of 352 decks
+4% synergy
Hidden Volcano
5% of 58 decks
+4% synergy
Mana Artifacts (39)
Sol Ring
70% of 2668 decks
-15% synergy
Arcane Signet
54% of 2668 decks
-17% synergy
Simic Signet
33% of 1029 decks
+29% synergy
Izzet Signet
31% of 352 decks
+24% synergy
Sky Diamond
26% of 2668 decks
+23% synergy
Azorius Signet
26% of 333 decks
+19% synergy
Dimir Signet
22% of 514 decks
+14% synergy
Orzhov Signet
22% of 45 decks
+16% synergy
Golgari Signet
21% of 345 decks
+19% synergy
Talisman of Creativity
20% of 352 decks
+14% synergy
Commander's Sphere
20% of 2668 decks
+3% synergy
Mind Stone
18% of 2668 decks
-1% synergy
Boros Signet
17% of 63 decks
+12% synergy
Fire Diamond
17% of 352 decks
+14% synergy
Thought Vessel
16% of 2668 decks
+0% synergy
Sultai Banner
16% of 345 decks
+16% synergy
Charcoal Diamond
15% of 514 decks
+12% synergy
Rakdos Signet
15% of 53 decks
+8% synergy
Everflowing Chalice
14% of 2668 decks
+9% synergy
Skyclave Relic
14% of 2655 decks
+12% synergy
Marble Diamond
12% of 333 decks
+10% synergy
Talisman of Conviction
11% of 63 decks
+6% synergy
Heraldic Banner
10% of 2668 decks
+8% synergy
Talisman of Indulgence
9% of 53 decks
+4% synergy
Decanter of Endless Water
9% of 2005 decks
+4% synergy
Gruul Signet
9% of 92 decks
+6% synergy
Talisman of Dominance
8% of 514 decks
+1% synergy
Talisman of Curiosity
8% of 1029 decks
+6% synergy
Midnight Clock
8% of 2668 decks
+6% synergy
Moss Diamond
7% of 1029 decks
+7% synergy
Springleaf Drum
7% of 2668 decks
+6% synergy
Fellwar Stone
7% of 2668 decks
-14% synergy
Raugrin Crystal
6% of 63 decks
+6% synergy
Selesnya Signet
6% of 158 decks
+4% synergy
Dimir Locket
6% of 514 decks
+6% synergy
Izzet Locket
6% of 352 decks
+6% synergy
Talisman of Progress
6% of 333 decks
+1% synergy
Azorius Locket
5% of 333 decks
+5% synergy
Caged Sun
5% of 2668 decks
+3% synergy
Lands (50)
Opulent Palace
67% of 345 decks
+64% synergy
Golgari Rot Farm
57% of 345 decks
+53% synergy
Simic Growth Chamber
53% of 1029 decks
+48% synergy
Dimir Aqueduct
46% of 514 decks
+41% synergy
Command Tower
43% of 2668 decks
-30% synergy
Temple of Mystery
42% of 1029 decks
+38% synergy
Seaside Citadel
41% of 158 decks
+38% synergy
Temple of Malady
36% of 345 decks
+32% synergy
Zagoth Triome
34% of 345 decks
+31% synergy
Spara's Headquarters
34% of 131 decks
+29% synergy
Dismal Backwater
33% of 514 decks
+31% synergy
Haunted Mire
33% of 270 decks
+31% synergy
Prairie Stream
32% of 333 decks
+25% synergy
Crumbling Necropolis
32% of 53 decks
+28% synergy
Canopy Vista
30% of 158 decks
+23% synergy
Tangled Islet
30% of 731 decks
+28% synergy
Lush Oasis
30% of 10 decks
+29% synergy
Myriad Landscape
30% of 2668 decks
+9% synergy
Azorius Chancery
29% of 333 decks
+26% synergy
Thornwood Falls
29% of 1029 decks
+27% synergy
Swiftwater Cliffs
29% of 352 decks
+27% synergy
Yavimaya Coast
28% of 1029 decks
+23% synergy
Golgari Guildgate
28% of 345 decks
+26% synergy
Dimir Guildgate
27% of 514 decks
+26% synergy
Izzet Boilerworks
27% of 352 decks
+23% synergy
Undercity Sewers
26% of 23 decks
+20% synergy
Contaminated Aquifer
26% of 384 decks
+25% synergy
Evolving Wilds
25% of 2668 decks
+3% synergy
Temple of Deceit
25% of 514 decks
+20% synergy
Temple of Epiphany
24% of 352 decks
+20% synergy
Frontier Bivouac
24% of 92 decks
+21% synergy
Jungle Hollow
23% of 345 decks
+21% synergy
Molten Tributary
23% of 243 decks
+22% synergy
Hinterland Harbor
23% of 1029 decks
+18% synergy
Tranquil Cove
23% of 333 decks
+21% synergy
Shivan Reef
22% of 352 decks
+17% synergy
Simic Guildgate
22% of 1029 decks
+20% synergy
Rugged Highlands
21% of 92 decks
+19% synergy
Mystic Monastery
21% of 63 decks
+18% synergy
Vineglimmer Snarl
20% of 995 decks
+18% synergy
Savage Lands
20% of 25 decks
+18% synergy
Raffine's Tower
20% of 40 decks
+16% synergy
Izzet Guildgate
20% of 352 decks
+18% synergy
Ketria Triome
20% of 92 decks
+16% synergy
Xander's Lounge
20% of 46 decks
+16% synergy
Dreamroot Cascade
19% of 961 decks
+16% synergy
Breeding Pool
19% of 1029 decks
+10% synergy
Temple of Enlightenment
19% of 333 decks
+15% synergy
Steam Vents
19% of 352 decks
+10% synergy
Path of Ancestry
19% of 2668 decks
-1% synergy